alexa Solvent extraction applied to the recovery of heavy metals from galvanic sludge.
Engineering

Engineering

Journal of Civil & Environmental Engineering

Author(s): Silva JE, Paiva AP, Soares D, Labrincha A, Castro F

Abstract Share this page

Abstract In this study, a hydrometallurgical treatment involving the solvent extraction and recovery of some heavy metals from a sulphuric acid leach solution of galvanic sludge, using di-(2-ethylhexyl)-phosphoric acid (D2EHPA) and bis-(2,4,4-trimethylpentyl)-phosphinic acid (Cyanex 272), both diluted in kerosene, has been investigated. The preliminary tests revealed the necessity to remove other metal species than zinc and nickel, contained in the leach solution, and therefore, processes to cement copper and precipitate chromium were then applied to finally obtain a Zn and Ni pregnant solution prior to solvent extraction. For the experimental conditions studied, Cyanex 272 showed a good recovery of Zn after the stripping stage using H2SO4, but D2EHPA effectively promoted a higher Zn extraction than Cyanex 272 did. The dependence of the solvent extraction method on variables such as pH, contact time and concentration of extractant, as well as the effect of different concentrations of sulphuric acid on stripping, are discussed. The discussion also includes the previous conditions developed to separate the main interfering metallic species from the leach solution in order to improve the extraction and recovery of zinc by solvent extraction. The final objective has been to achieve a solution as pure as possible to recover nickel sulphate. This article was published in J Hazard Mater and referenced in Journal of Civil & Environmental Engineering

Relevant Expert PPTs

Relevant Speaker PPTs

  • Georgia Torres
    Effect of exercise intervention programs on anthropometric, physiological and cardiometabolic parameters of persons with and without metabolic syndrome
    PPT Version | PDF Version
  • Recep Çelik
    GIS based assessment effect of irrigation on groundwater level changes in agricultural areas: A case study on the Bismil plain in the Upper Tigris Basin
    PPT Version | PDF Version
  • Wondalem Misganaw Golie
    Adsorption equilibrium and kinetic study of removal of nitrate from drinking water supplies by chitosan composite
    PPT Version | PDF Version
  • Soha S M Mostafa
    Phycoremediation of olive mill wastewater (OMW) using cyanobacteria for sustainable bio fertilizer and biofuel production
    PPT Version | PDF Version
  • Tochukwu Ezechi Ebe
    Contamination of surface and ground water due to anthropogenic activities in Ogwuama community of Ahiazu, Imo State, Nigeria
    PPT Version | PDF Version
  • Meral Topcu Sulak
    Evaluating water resources quality and water pollution in Karabuk, Turkey
    PPT Version | PDF Version
  • Ines Bouaziz
    Water treatment containing organic compounds by coupling adsorption and electrochemical degradation at BDD anode: Sawdust adsorption performance for the treatment of dilute phenol solutions
    PPT Version | PDF Version
  • Luis Gosalbez
    Key regulatory issues in the development of pharmabiotics in Europe
    PPT Version | PDF Version
  • Brian Littlechild
    The management of violence and aggression against staff in mental health work: responding effectively through a co-production approach to issues for service users, carers, staff and agencies
    PPT Version | PDF Version
  • Birguy Lamizana-Diallo,
    Recycling wastewater yields multiple benefits
    PPT Version | PDF Version
  • Yosef Yarden
    Classically, the 3’untranslated region (3’UTR) is that region in eukaryotic protein-coding genes from the translation termination codon to the polyA signal. It is transcribed as an integral part of the mRNA encoded by the gene. However, there exists another kind of RNA, which consists of the 3’UTR alone, without all other elements in mRNA such as 5’UTR and coding region. The importance of independent 3’UTR RNA (referred as I3’UTR) was prompted by results of artificially introducing such RNA species into malignant mammalian cells. Since 1991, we found that the middle part of the 3’UTR of the human nuclear factor for interleukin-6 (NF-IL6) or C/EBP gene exerted tumor suppression effect in vivo. Our subsequent studies showed that transfection of C/EBP 3’UTR led to down-regulation of several genes favorable for malignancy and to up-regulation of some genes favorable for phenotypic reversion. Also, it was shown that the sequences near the termini of the C/EBP 3’UTR were important for its tumor suppression activity. Then, the C/EBP 3’UTR was found to directly inhibit the phosphorylation activity of protein kinase CPKC in SMMC-7721, a hepatocarcinoma cell line. Recently, an AU-rich region in the C/EBP 3’UTR was found also to be responsible for its tumor suppression. Recently we have also found evidence that the independent C/EBP 3’UTR RNA is actually exists in human tissues, such as fetal liver and heart, pregnant uterus, senescent fibroblasts etc. Through 1990’s to 2000’s, world scientists found several 3’UTR RNAs that functioned as artificial independent RNAs in cancer cells and resulted in tumor suppression. Interestingly, majority of genes for these RNAs have promoter-like structures in their 3’UTR regions, although the existence of their transcribed products as independent 3’UTR RNAs is still to be confirmed. Our studies indicate that the independent 3’UTR RNA is a novel non-coding RNA species whose function should be the regulation not of the expression of their original mRNA, but of some essential life activities of the cell as a whole.
    PPT Version | PDF Version
  • Hoda Farouk Zahran
    Usage of sea water in agriculture: An overview
    PPT Version | PDF Version
  • Ying Qing Yu
    N-linked Glycan Characterization and Profiling: Combining the Power of a Novel Labeling Reagent and a Streamlined Analytical Workflow
    PPT Version | PDF Version
  • Isabel Martín
    Sustainable water reuse. The case of rural areas and small settlements
    PPT Version | PDF Version
  • Raquel García Pacheco
    Evaluation of the ppm-h concept for end-of-life RO membrane into recycled NF and UF membranes
    PPT Version | PDF Version

Recommended Conferences

Relevant Topics

Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

 
© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version
adwords